<template>
  <Header></Header>

  <div class="courseContainer">
    <div class="courseInfoTop">
      <div class="info-container">
        <ul class="route">
          <li class="route-item" style="cursor: pointer">
            <router-link to="/course" style="color: #fff">课程</router-link>
          </li>
          <li class="route-item"><i class="el-icon-arrow-right"></i></li>
          <li class="route-item" style="cursor: pointer">
            {{ courseInfo.discountPrice === 0 ? "免费课" : "会员课程" }}
          </li>
          <li class="route-item"><i class="el-icon-arrow-right"></i></li>
          <li class="route-item">{{ courseInfo.courseName }}</li>
        </ul>
        <div class="name">{{ courseInfo.courseName }}</div>
        <div class="info">
          <div class="Avat">
            <img src="../assets/img/Avat62.png" alt="" />
          </div>
          <ul class="teacherName">
            <li class="name-item">
              {{ courseInfo.courseName }}
              <img src="../assets/img/teacherStart.png" alt="" />
            </li>
            <li class="name-item">金牌讲师</li>
          </ul>
          <ul class="access">
            <li class="access-item">难度</li>
            <li class="access-item">
              {{ courseInfo.courseLevel }}
            </li>
            <li class="access-item">·</li>
            <li class="access-item">时长</li>
            <li class="access-item">{{ courseInfo.totalHour }}个小时</li>
            <li class="access-item">·</li>
            <li class="access-item">学习人数</li>
            <li class="access-item">
              {{ courseInfo.purchaseCounter + courseInfo.purchaseCnt }}人
            </li>
            <li class="access-item">·</li>
            <li class="access-item">综合评分</li>
            <li class="access-item">10.00</li>
          </ul>
        </div>
      </div>
    </div>

    <div class="info-nav">
      <div class="nav-container">
        <div class="chapter-item" @click="active = true">
          <div :class="active == true ? 'active1' : ''">章节</div>
          <div :class="active == true ? 'line active2' : ''"></div>
        </div>
        <div class="chapter-item" @click="active = false">
          <div :class="active == false ? 'active1' : ''">下载资料</div>
          <div :class="active == false ? 'line active2' : ''"></div>
        </div>
      </div>
    </div>
    <div class="course" v-if="active">
      <div class="main">
        <div class="introduction">
          <div class="desc">该课程暂无介绍</div>
          <div class="btn">
            <button class="btn-item active">立即购买</button>
            <button class="btn-item" @click="addCart">加入购物车</button>
          </div>
        </div>
        <div class="video" v-for="item in courseChapters" :key="item.id">
          <div class="chapterName">{{ item.chapterName }}</div>
          <div class="chapterDesc">{{ item.description }}</div>
          <ul class="videos">
            <li class="video-item" v-for="k in item.children" :key="k.id">
              <div class="video-itemIcon">
                <i class="el-icon-video-camera"></i>
              </div>

              <div class="item-name">
                <span class="shipin">视频：</span>
                <span class="chapterName">{{ k.chapterName }}</span>
                <span class="free" v-if="k.publicType === 2">试看</span>
              </div>
              <button class="btn-learn" @click="goPlay(item, k.id)">
                开始学习
              </button>
              <div class="clearfloat"></div>
            </li>
          </ul>
        </div>
      </div>
    </div>
    <div v-else>
      <!-- 判断数组长度是不是大于0 -->
      <div v-if="attachments.length > 0">
        <div class="down" v-for="item in attachments" :key="item.id">
          <div class="source">
            <span class="downloadCourse">{{ item.attachmentName }}</span>
            <button class="downloadbtn" @click="downloadSource(item)">
              下载资料
            </button>
          </div>
        </div>
      </div>
      <div>
        <el-empty description="该课程暂无资料"></el-empty>
      </div>
    </div>
  </div>
  <Footer></Footer>
</template>

<script setup>
//组件
import Header from "../components/common/Header.vue";
import Footer from "../components/common/Footer.vue";
import { ElMessageBox, ElMessage } from "element-plus";
import { useUserStore } from "../store/user";
import { useRouter } from "vue-router";
import {
  getCourseDetail,
  courseCheckAuth,
  downloadAttachment,
} from "../utils/api/courseManage";
import { addShopCar } from "../utils/api/cart";
import { onBeforeMount, reactive } from "vue";
import { creatToken } from "../utils/api/createToken";
let active = ref(true);
let courseChapters = ref([]);
let route = useRoute();
let courseId = route.params.id;
let courseInfo = ref([]);
let attachments = ref([]);
const router = useRouter(); // 组合式api 一个函数
const useStore = useUserStore();

onBeforeMount(() => {
  getCourseDetail({ courseId }).then((res) => {
    courseInfo.value = res.data.data;
    courseChapters.value = res.data.data.bizCourseChapters;
    attachments.value = res.data.data.bizCourseAttachments;
  });
});

//下载资料
const downloadSource = (item) => {
  // 判断是否登录(依据token来)
  if (!useStore.token) {
    ElMessage.info({
      message: "请先登录",
    });
    router.push("/login");
    return;
  }
  courseCheckAuth({ courseId: item.courseId }).then((res) => {
    if (!res.data.data.hasAuth) {
      ElMessage.info({
        message: "购买课程才可以下载资料",
      });
      return; // 立即终止函数调用
    }
    //调下载api
    downloadAttachment({
      courseId: item.courseId,
      attachmentId: item.id,
    }).then((res) => {
      // res接收到的就是文件流 (一堆?+字符组成的乱码)
      // api加了responseType: 'blob' 后返回blob对象
      const blob = new Blob([res]);
      let fileName = item.attachmentName;
      let fileUrl = item.attachmentUrl;
      const extName = fileUrl.substring(fileUrl.lastIndexOf("."));
      fileName = fileName + extName; // 文件名+后缀
      const link = document.createElement("a");
      link.download = fileName;
      link.target = "_blank";
      link.style.display = "none";
      link.href = URL.createObjectURL(blob); // 完整url
      document.body.appendChild(link); // 创建a连接
      link.click(); //自动点击
      URL.revokeObjectURL(link.href);
      document.body.removeChild(link); // 删除
    });
  });
};

// 开始学习
const goPlay = (item, chapterId) => {
  if (!useStore.token) {
    ElMessage.info({
      message: "请先登录",
    });
    router.push("/login");
    return;
  }
  courseCheckAuth({ courseId: item.courseId }).then((res) => {
    if (!res.data.data.hasAuth) {
      ElMessage.info({
        message: "购买课程才可以下载资料",
      });
      return; // 立即终止函数调用
    }
    //有权限(路由参数用于跳转该页面时传递参数过去)
    router.push("/course-play/" + item.courseId + "/" + chapterId);
  });
};

// 加入购物车
const addCart = () => {
  creatToken().then((res) => {
    let token = res.data.token;
 
  addShopCar(
    {
      courseId,
      memberId: useUserStore().userInfo.id,
    },
    token
  ).then((res) => {
    console.log(res);
  });
   });
};
</script>





<style scoped>
.courseContainer {
  width: 100%;
  height: 100%;
  background: #f8fafc;
  overflow: hidden;
}
.main {
  margin: 40px auto;
  width: 1200px;
  height: 100%;
}
.courseInfoTop {
  width: 100%;
  height: 200px;
  background-image: url("../assets/img/courseInfobg1920.png");
}
.nav-container {
  width: 1200px;
  margin: 0 auto;
  color: #333333;
  display: flex;
}
/* .chapter-item  .active{
color: #388FFF;

} */
/* 背景部分开始 */
.courseInfoTop .info-container {
  margin: 0 auto;
  width: 1200px;
  height: 200px;
  color: #ffffff;
  z-index: 5;
}
.route {
  /*margin-left: 50px;*/
  padding-top: 20px;
  display: flex;
  font-size: 14px;
}
.route .route-item {
  margin-right: 10px;
}
.name {
  margin: 30px 0 10px 0px;
  font-size: 24px;
}
.info {
  display: flex;
  /*margin-left: 50px;*/
}
.info .Avat {
  width: 60px;
  height: 60px;
  border-radius: 50%;
}
.info .Avat img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
}
.teacherName {
  margin: 8px 0 0 8px;
}
.name-item img {
  width: 14px;
  height: 14px;
}
.access {
  margin: 0 0 0 100px;
  display: flex;
}
.access .access-item {
  margin-right: 10px;
  line-height: 60px;
}
/* 背景部分结束 */

/* 导航栏开始 */
.info-nav {
  width: 100%;

  background: #ffffff;
  box-shadow: 0px 3px 6px rgba(0, 0, 0, 0.16);
}
.course {
  margin: 0 auto;
  width: 1200px;
}
.chapter {
  display: flex;
  font-weight: 600;
  color: #333333;
  margin-left: 50px;
  font-size: 20px;
}
.chapter-item {
  padding-bottom: 8px;
  font-size: 20px;
  font-weight: bold;
  line-height: 80px;
  margin-right: 70px;
  cursor: pointer;
  position: relative;
}
.chapter-item .active1 {
  color: #388fff;
}
.chapter-item .active2 {
  position: absolute;
  width: 70%;
  top: 63px;
  left: calc(30% / 2);
  height: 4px;
  background: #388fff;
  border-radius: 2px;
}

/* 导航栏结束 */
/* 课程介绍开始 */
.introduction {
  /*margin-left: 50px;*/
  /*padding: 20px;*/
  width: 1210px;
  background: #ffffff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0px 3px 6px rgba(0, 0, 0, 0.09);
}
.desc {
  padding: 20px;
  color: #474747;
  line-height: 35px;
}
.btn {
  float: right;
  margin-top: 10px;
  padding: 0 20px 20px;
}
.btn-item {
  width: 120px;
  height: 40px;
  /*margin: 0 20px 0 0;*/
  padding: 0px;
  border: 0px;
  outline: none;
  color: #f11d1d;
  border-radius: 23px;
  cursor: pointer;
}
.btn .active {
  background: #f11d1d !important;
  color: #ffffff;
  margin-right: 10px;
}
/* 课程介绍结束 */

/* 视频目录开始 */
.video {
  margin: 20px 0;
  padding: 20px;
  width: 1170px;
  background: #ffffff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0px 3px 6px rgba(0, 0, 0, 0.09);
}
.video .chapterName {
  font-weight: bold;
  font-size: 20px;
  color: #333333;
}
.video .free {
  padding-left: 20px;
  font-size: 14px;
  color: #388fff;
}
.chapterDesc {
  margin: 10px 0;
  font-size: 13px;
  color: #5c5c5c;
}
.video-item {
  height: 40px;
  line-height: 40px;
  padding: 5px 0;
  /*margin: 0 0 10px 0;*/
  border-radius: 8px;
}
.video-item:hover {
  cursor: pointer;
  background: rgba(53, 133, 255, 0.2);
  border-radius: 8px;
  color: #388fff !important;
}
.video-item .shipin {
  color: #333333;
  font-weight: bold;
}
.video-item .chapterName {
  font-size: 16px;
  font-weight: 400;
  color: #333333;
}
.video-itemIcon,
.item-name {
  float: left;
  padding-left: 10px;
}
.btn-learn {
  margin: 5px 5px 0 0;
  float: right;
  right: -100px;
  width: 80px;
  height: 30px;
  line-height: 30px;
  border: 0px;
  outline: none;
  color: #fff;
  background: #388fff;
  border-radius: 12px;
  cursor: pointer;
}
.clearfloat {
  clear: both;
}
/* 视频目录结束 */
.source {
  margin: 2px 0;
  padding: 5px;
  display: flex;
  justify-content: space-between;
  box-shadow: 0px 3px 6px rgba(0, 0, 0, 0.09);
}
.down {
  margin: 10px auto !important;
  width: 1200px;
  height: 100%;
  padding: 5px;
  background: #ffffff;
  box-sizing: border-box;
  border-radius: 8px;
}
.down:first-child {
  margin: 40px 0 5px 0;
}
.downloadbtn {
  width: 100px;
  height: 30px;
  line-height: 30px;
  background: #388fff;
  border: none;
  border-radius: 8px;
  color: #fff;
  font-size: 14px;
  cursor: pointer;
}
</style>